<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<meta name="viewport" content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no" />
		<title>图像模糊加载</title>
		<style type="text/css">
			/* The fade in / fade out for the canvas and image might be off, I can't tell
 */
/**
 * Makes an element expand to fill its container 
 * using absolute positioning
 */
body {
  background-color: #eee;
  color: #444;
  font-family: Karla;
  line-height: 1.6;
}

.wrapper {
  max-width: 900px;
  margin: 0 auto;
}

.aspect-ratio-fill {
  position: relative;
  display: block;
}

.ProgressiveMedia {
  background-color: #eee;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}
.ProgressiveMedia.isImageLoaded > .ProgressiveMedia__image {
  opacity: 1;
}

.ProgressiveMedia__thumbnail {
  display: none;
}

.ProgressiveMedia__image,
.ProgressiveMedia__canvas {
  border-radius: 3px;
  display: block;
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
}

.ProgressiveMedia__image {
  opacity: 0;
  -webkit-transition: opacity 400ms 0ms;
  transition: opacity 400ms 0ms;
  z-index: 1;
}
/**
 * Other stuff that doesn't pertain to the component itself 
 */
.details-wrapper {
  position: absolute;
  width: 100%;
  bottom: 50px;
  z-index: 3;
}

.details {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -ms-flex-wrap: wrap;
      flex-wrap: wrap;
}
.details > * {
  margin-right: 5px;
}

label {
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  background-color: rgba(255, 255, 255, 0.7);
  box-shadow: 0 2px 3px 0 rgba(0, 0, 0, 0.1), 0 2px 4px 0 rgba(0, 0, 0, 0.05);
  border-radius: 3px;
  display: -webkit-inline-box;
  display: -ms-inline-flexbox;
  display: inline-flex;
  font-size: 14px;
  line-height: 20px;
  padding: 0 0 0 18px;
}

input[type="text"] {
  background-color: rgba(255, 255, 255, 0.7);
  border: 0;
  border-left: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: 0 3px 3px 0;
  color: #555;
  font-size: 13px;
  font-weight: bold;
  line-height: 20px;
  padding: 15px 0;
  margin-left: 20px;
}

.Settings {
  margin-bottom: 20px;
  position: relative;
}

.Settings__text {
  padding: 15px 0;
  display: inine-block;
}

.Settings__input {
  background-color: rgba(255, 255, 255, 0.4);
  text-align: center;
  width: 120px;
}

.Settings__range {
  margin: 0 10px;
}

.Settings__range__text {
  font-weight: bold;
  opacity: 0;
  position: absolute;
  -webkit-transition: opacity 0.2s;
  transition: opacity 0.2s;
  top: -20px;
  right: 0px;
}
.Settings__range__text.isShowing {
  opacity: 1;
}

.Button {
  background-color: rgba(255, 255, 255, 0.7);
  border: 0;
  border-radius: 3px;
  box-shadow: 0 3px 6px 0 rgba(0, 0, 0, 0.08), 0 4px 12px 0 rgba(0, 0, 0, 0.08);
  color: #444;
  cursor: pointer;
  display: inline-block;
  font-size: 14px;
  font-weight: bold;
  line-height: 20px;
  min-width: 170px;
  outline: 0;
  padding: 15px 36px;
  position: relative;
  text-align: center;
  -webkit-transition: box-shadow 0.15s, background-color 0.15s;
  transition: box-shadow 0.15s, background-color 0.15s;
  -webkit-user-select: none;
     -moz-user-select: none;
      -ms-user-select: none;
          user-select: none;
  margin-bottom: 20px;
}
.Button:active {
  box-shadow: 0 2px 3px 0 rgba(0, 0, 0, 0.1), 0 2px 4px 0 rgba(0, 0, 0, 0.05);
}

		</style>
	</head>
	<body>
		<div class="wrapper">
  <div class="aspect-ratio-fill">
    <div class="ProgressiveMedia">
      <canvas class="ProgressiveMedia__canvas" width="75" height="38.671875"></canvas><img class="ProgressiveMedia__image" data-src="https://images.unsplash.com/photo-1436564989038-18b9958df72b?crop=entropy&fit=crop&fm=jpg&h=825&ixjsv=2.1.0&ixlib=rb-0.3.5&q=80&w=1600"/><img class="ProgressiveMedia__thumbnail" src=""/>
    </div>
  </div>
</div>
<div class="details-wrapper">
  <div class="details">
    <button class="Button" id="show">Show Canvas</button>
    <div class="Settings">
      <label title="The time of the fade transition in seconds or milliseconds"> 
        <div class="Settings__text">Transition Time:</div>
        <input class="Settings__input" id="transitionTime" type="text" value="400ms" placeholder="time" maxLength="10"/>
      </label>
    </div>
    <div class="Settings">
      <label title="The max width of wrapper"> 
        <div class="Settings__text">Wrapper Width:</div>
        <input class="Settings__input" id="width" type="text" value="900px" placeholder="Wrapper Width" maxLength="10"/>
      </label>
    </div>
    <div class="Settings">
      <label title="The blur radius">
        <div class="Settings__text">Canvas Blur:</div>
        <div class="Settings__range__text" id="rangeText">180</div>
        <input class="Settings__range" id="blur" type="range" value="7" placeholder="Blur" min="0" max="100"/>
      </label>
    </div>
  </div>
</div>
<script type="text/javascript">
	function main() {
	/**
	 * The amount to blur the canvas 
	 */
	const MAX_BLUR_RADIUS = 180;

	/**
	 * The delay so the it's easier to observe the initial fade in
	 */
	const INITIAL_DELAY = 1000;

	var blurRadius = 7;

	var component = $('.ProgressiveMedia');
	var image = $('.ProgressiveMedia__image');
	var canvas = $('.ProgressiveMedia__canvas');
	var thumbnail = $('.ProgressiveMedia__thumbnail');

	var context = canvas.getContext('2d');

	/**
	 * The aspect-ratio-fill padding is set here. 
	 */
	var aspectRatioFill = document.querySelector('.aspect-ratio-fill');
	var percentage = (thumbnail.naturalHeight / thumbnail.naturalWidth) * 100;
	aspectRatioFill.style.paddingBottom = `${percentage}%`;

	/**
	 * Draw the thumbnail onto the canvas, then blur it
	 */
	drawThumbnail(blurRadius);

	/**
	 * Load the image in. Once it's loaded, add a class to the 
	 * component wrapper that fades in the image and fades out 
	 * the canvas element.
	 */
	image.src = image.dataset.src;
	image.addEventListener('load', function onImageLoaded() {
		image.removeEventListener('load', onImageLoaded);

		// This delay is only set so the we can see the blur effect more clearly on page load  
		setTimeout(function() {
			component.classList.add('isImageLoaded');
		}, INITIAL_DELAY);
	});

	/**
	 * Draws the thumbnail into the canvas and blurs it
	 */
	function drawThumbnail(blur) {
		context
			.drawImage(thumbnail, 0, 0, thumbnail.naturalWidth,
				thumbnail.naturalHeight, 0, 0, canvas.width, canvas.height);
		StackBlur.canvasRGBA(canvas, 0, 0, canvas.width, canvas.height, blur);
	}

	/**
	 * The rest of this does not pertain to the ProgressiveMedia 
	 * component itself 
	 */
	const WRAPPER_WIDTH_KEY = 'wrapperWidth';
	const TRANSITION_KEY = 'transitionTime';

	var defaultWrapperWidth = '900px';
	var defaultTransitionTime = '400ms';

	var button = $('#show');
	var transitionInput = $('#transitionTime');
	var widthInput = $('#width');
	var blurRange = $('#blur');
	var rangeTooltip = $('#rangeText');
	var wrapper = $('.wrapper');

	blurRange.addEventListener('input', function() {
		var blur = (this.value * MAX_BLUR_RADIUS) / 100;
		drawThumbnail(blur);
		rangeTooltip.textContent = blur;

		if (!rangeTooltip.classList.contains('isShowing')) {
			rangeTooltip.classList.add('isShowing');
		}
	});

	blurRange.addEventListener('change', function onRangeChange() {
		rangeTooltip.classList.remove('isShowing');
	});

	button.addEventListener('click', function onButtonClick() {
		var hasClass = component.classList.contains('isImageLoaded');
		button.textContent = (hasClass) ? 'Show Image' : 'Show Canvas';
		component.classList.toggle('isImageLoaded');
	});

	transitionInput.addEventListener('keyup', function onInputKeydown() {
		image.style.transitionDuration = this.value;
		canvas.style.transitionDuration = this.value;
		storage.set(TRANSITION_KEY, this.value);
	});

	widthInput.addEventListener('keyup', function onInputKeydown() {
		wrapper.style.maxWidth = this.value;

		// Remember the wrapper width 
		storage.set(WRAPPER_WIDTH_KEY, this.value);
	});

	var storage = {
		set: function(key, value) {
			localStorage.setItem(key, JSON.stringify(value));
		},
		get: function(key, defaultValue) {
			var value = localStorage.getItem(key)
			if (value === null) {
				return defaultValue;
			}

			return JSON.parse(value);
		}
	};

	// Remember the settings in local storage
	widthInput.value = storage.get(WRAPPER_WIDTH_KEY, defaultWrapperWidth);
	wrapper.style.maxWidth = storage.get(WRAPPER_WIDTH_KEY, defaultWrapperWidth);

	transitionInput.value = storage.get(TRANSITION_KEY, defaultTransitionTime);
	image.style.transitionDuration = storage.get(TRANSITION_KEY, defaultTransitionTime);
	canvas.style.transitionDuration = storage.get(TRANSITION_KEY, defaultTransitionTime);

	function $(selector) {
		return document.querySelector(selector);
	}
}

// Set a timeout so we make sure StackBlur is defined
setTimeout(main, 0);

/**
 * StackBlur.js
 * from https://github.com/flozz/StackBlur/
 */
(function(f) {
	if (typeof exports === "object" && typeof module !== "undefined") {
		module.exports = f()
	} else if (typeof define === "function" && define.amd) {
		define([], f)
	} else {
		var g;
		if (typeof window !== "undefined") {
			g = window
		} else if (typeof global !== "undefined") {
			g = global
		} else if (typeof self !== "undefined") {
			g = self
		} else {
			g = this
		}
		g.StackBlur = f()
	}
})(function() {
	var define, module, exports;
	return (function e(t, n, r) {
		function s(o, u) {
			if (!n[o]) {
				if (!t[o]) {
					var a = typeof require == "function" && require;
					if (!u && a) return a(o, !0);
					if (i) return i(o, !0);
					var f = new Error("Cannot find module '" + o + "'");
					throw f.code = "MODULE_NOT_FOUND", f
				}
				var l = n[o] = {
					exports: {}
				};
				t[o][0].call(l.exports, function(e) {
					var n = t[o][1][e];
					return s(n ? n : e)
				}, l, l.exports, e, t, n, r)
			}
			return n[o].exports
		}
		var i = typeof require == "function" && require;
		for (var o = 0; o < r.length; o++) s(r[o]);
		return s
	})({
		1: [function(require, module, exports) {
			/*
			    StackBlur - a fast almost Gaussian Blur For Canvas

			    Version:     0.5
			    Author:        Mario Klingemann
			    Contact:     mario@quasimondo.com
			    Website:    http://www.quasimondo.com/StackBlurForCanvas
			    Twitter:    @quasimondo

			    In case you find this class useful - especially in commercial projects -
			    I am not totally unhappy for a small donation to my PayPal account
			    mario@quasimondo.de

			    Or support me on flattr:
			    https://flattr.com/thing/72791/StackBlur-a-fast-almost-Gaussian-Blur-Effect-for-CanvasJavascript

			    Copyright (c) 2010 Mario Klingemann

			    Permission is hereby granted, free of charge, to any person
			    obtaining a copy of this software and associated documentation
			    files (the "Software"), to deal in the Software without
			    restriction, including without limitation the rights to use,
			    copy, modify, merge, publish, distribute, sublicense, and/or sell
			    copies of the Software, and to permit persons to whom the
			    Software is furnished to do so, subject to the following
			    conditions:

			    The above copyright notice and this permission notice shall be
			    included in all copies or substantial portions of the Software.

			    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
			    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
			    OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
			    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
			    HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
			    WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
			    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
			    OTHER DEALINGS IN THE SOFTWARE.
			    */

			var mul_table = [
				512, 512, 456, 512, 328, 456, 335, 512, 405, 328, 271, 456, 388, 335, 292, 512,
				454, 405, 364, 328, 298, 271, 496, 456, 420, 388, 360, 335, 312, 292, 273, 512,
				482, 454, 428, 405, 383, 364, 345, 328, 312, 298, 284, 271, 259, 496, 475, 456,
				437, 420, 404, 388, 374, 360, 347, 335, 323, 312, 302, 292, 282, 273, 265, 512,
				497, 482, 468, 454, 441, 428, 417, 405, 394, 383, 373, 364, 354, 345, 337, 328,
				320, 312, 305, 298, 291, 284, 278, 271, 265, 259, 507, 496, 485, 475, 465, 456,
				446, 437, 428, 420, 412, 404, 396, 388, 381, 374, 367, 360, 354, 347, 341, 335,
				329, 323, 318, 312, 307, 302, 297, 292, 287, 282, 278, 273, 269, 265, 261, 512,
				505, 497, 489, 482, 475, 468, 461, 454, 447, 441, 435, 428, 422, 417, 411, 405,
				399, 394, 389, 383, 378, 373, 368, 364, 359, 354, 350, 345, 341, 337, 332, 328,
				324, 320, 316, 312, 309, 305, 301, 298, 294, 291, 287, 284, 281, 278, 274, 271,
				268, 265, 262, 259, 257, 507, 501, 496, 491, 485, 480, 475, 470, 465, 460, 456,
				451, 446, 442, 437, 433, 428, 424, 420, 416, 412, 408, 404, 400, 396, 392, 388,
				385, 381, 377, 374, 370, 367, 363, 360, 357, 354, 350, 347, 344, 341, 338, 335,
				332, 329, 326, 323, 320, 318, 315, 312, 310, 307, 304, 302, 299, 297, 294, 292,
				289, 287, 285, 282, 280, 278, 275, 273, 271, 269, 267, 265, 263, 261, 259
			];

			var shg_table = [
				9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17,
				17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19,
				19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20,
				20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21,
				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21,
				21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22,
				22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22,
				22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23,
				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
				23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23,
				23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
				24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
				24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
				24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
				24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24
			];

			function processImage(img, canvas, radius, blurAlphaChannel) {
				if (typeof(img) == 'string') {
					var img = document.getElementById(img);
				} else if (!img instanceof HTMLImageElement) {
					return;
				}
				var w = img.naturalWidth;
				var h = img.naturalHeight;

				if (typeof(canvas) == 'string') {
					var canvas = document.getElementById(canvas);
				} else if (!canvas instanceof HTMLCanvasElement) {
					return;
				}

				canvas.style.width = w + 'px';
				canvas.style.height = h + 'px';
				canvas.width = w;
				canvas.height = h;

				var context = canvas.getContext('2d');
				context.clearRect(0, 0, w, h);
				context.drawImage(img, 0, 0);

				if (isNaN(radius) || radius < 1) return;

				if (blurAlphaChannel)
					processCanvasRGBA(canvas, 0, 0, w, h, radius);
				else
					processCanvasRGB(canvas, 0, 0, w, h, radius);
			}

			function getImageDataFromCanvas(canvas, top_x, top_y, width, height) {
				if (typeof(canvas) == 'string')
					var canvas = document.getElementById(canvas);
				else if (!canvas instanceof HTMLCanvasElement)
					return;

				var context = canvas.getContext('2d');
				var imageData;

				try {
					try {
						imageData = context.getImageData(top_x, top_y, width, height);
					} catch (e) {

						// NOTE: this part is supposedly only needed if you want to work with local files
						// so it might be okay to remove the whole try/catch block and just use
						// imageData = context.getImageData(top_x, top_y, width, height);
						try {
							netscape.security.PrivilegeManager.enablePrivilege("UniversalBrowserRead");
							imageData = context.getImageData(top_x, top_y, width, height);
						} catch (e) {
							alert("Cannot access local image");
							throw new Error("unable to access local image data: " + e);
							return;
						}
					}
				} catch (e) {
					alert("Cannot access image");
					throw new Error("unable to access image data: " + e);
				}

				return imageData;
			}

			function processCanvasRGBA(canvas, top_x, top_y, width, height, radius) {
				if (isNaN(radius) || radius < 1) return;
				radius |= 0;

				var imageData = getImageDataFromCanvas(canvas, top_x, top_y, width, height);

				imageData = processImageDataRGBA(imageData, top_x, top_y, width, height, radius);

				canvas.getContext('2d').putImageData(imageData, top_x, top_y);
			}

			function processImageDataRGBA(imageData, top_x, top_y, width, height, radius) {
				var pixels = imageData.data;

				var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum, a_sum,
					r_out_sum, g_out_sum, b_out_sum, a_out_sum,
					r_in_sum, g_in_sum, b_in_sum, a_in_sum,
					pr, pg, pb, pa, rbs;

				var div = radius + radius + 1;
				var w4 = width << 2;
				var widthMinus1 = width - 1;
				var heightMinus1 = height - 1;
				var radiusPlus1 = radius + 1;
				var sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;

				var stackStart = new BlurStack();
				var stack = stackStart;
				for (i = 1; i < div; i++) {
					stack = stack.next = new BlurStack();
					if (i == radiusPlus1) var stackEnd = stack;
				}
				stack.next = stackStart;
				var stackIn = null;
				var stackOut = null;

				yw = yi = 0;

				var mul_sum = mul_table[radius];
				var shg_sum = shg_table[radius];

				for (y = 0; y < height; y++) {
					r_in_sum = g_in_sum = b_in_sum = a_in_sum = r_sum = g_sum = b_sum = a_sum = 0;

					r_out_sum = radiusPlus1 * (pr = pixels[yi]);
					g_out_sum = radiusPlus1 * (pg = pixels[yi + 1]);
					b_out_sum = radiusPlus1 * (pb = pixels[yi + 2]);
					a_out_sum = radiusPlus1 * (pa = pixels[yi + 3]);

					r_sum += sumFactor * pr;
					g_sum += sumFactor * pg;
					b_sum += sumFactor * pb;
					a_sum += sumFactor * pa;

					stack = stackStart;

					for (i = 0; i < radiusPlus1; i++) {
						stack.r = pr;
						stack.g = pg;
						stack.b = pb;
						stack.a = pa;
						stack = stack.next;
					}

					for (i = 1; i < radiusPlus1; i++) {
						p = yi + ((widthMinus1 < i ? widthMinus1 : i) << 2);
						r_sum += (stack.r = (pr = pixels[p])) * (rbs = radiusPlus1 - i);
						g_sum += (stack.g = (pg = pixels[p + 1])) * rbs;
						b_sum += (stack.b = (pb = pixels[p + 2])) * rbs;
						a_sum += (stack.a = (pa = pixels[p + 3])) * rbs;

						r_in_sum += pr;
						g_in_sum += pg;
						b_in_sum += pb;
						a_in_sum += pa;

						stack = stack.next;
					}

					stackIn = stackStart;
					stackOut = stackEnd;
					for (x = 0; x < width; x++) {
						pixels[yi + 3] = pa = (a_sum * mul_sum) >> shg_sum;
						if (pa != 0) {
							pa = 255 / pa;
							pixels[yi] = ((r_sum * mul_sum) >> shg_sum) * pa;
							pixels[yi + 1] = ((g_sum * mul_sum) >> shg_sum) * pa;
							pixels[yi + 2] = ((b_sum * mul_sum) >> shg_sum) * pa;
						} else {
							pixels[yi] = pixels[yi + 1] = pixels[yi + 2] = 0;
						}

						r_sum -= r_out_sum;
						g_sum -= g_out_sum;
						b_sum -= b_out_sum;
						a_sum -= a_out_sum;

						r_out_sum -= stackIn.r;
						g_out_sum -= stackIn.g;
						b_out_sum -= stackIn.b;
						a_out_sum -= stackIn.a;

						p = (yw + ((p = x + radius + 1) < widthMinus1 ? p : widthMinus1)) << 2;

						r_in_sum += (stackIn.r = pixels[p]);
						g_in_sum += (stackIn.g = pixels[p + 1]);
						b_in_sum += (stackIn.b = pixels[p + 2]);
						a_in_sum += (stackIn.a = pixels[p + 3]);

						r_sum += r_in_sum;
						g_sum += g_in_sum;
						b_sum += b_in_sum;
						a_sum += a_in_sum;

						stackIn = stackIn.next;

						r_out_sum += (pr = stackOut.r);
						g_out_sum += (pg = stackOut.g);
						b_out_sum += (pb = stackOut.b);
						a_out_sum += (pa = stackOut.a);

						r_in_sum -= pr;
						g_in_sum -= pg;
						b_in_sum -= pb;
						a_in_sum -= pa;

						stackOut = stackOut.next;

						yi += 4;
					}
					yw += width;
				}

				for (x = 0; x < width; x++) {
					g_in_sum = b_in_sum = a_in_sum = r_in_sum = g_sum = b_sum = a_sum = r_sum = 0;

					yi = x << 2;
					r_out_sum = radiusPlus1 * (pr = pixels[yi]);
					g_out_sum = radiusPlus1 * (pg = pixels[yi + 1]);
					b_out_sum = radiusPlus1 * (pb = pixels[yi + 2]);
					a_out_sum = radiusPlus1 * (pa = pixels[yi + 3]);

					r_sum += sumFactor * pr;
					g_sum += sumFactor * pg;
					b_sum += sumFactor * pb;
					a_sum += sumFactor * pa;

					stack = stackStart;

					for (i = 0; i < radiusPlus1; i++) {
						stack.r = pr;
						stack.g = pg;
						stack.b = pb;
						stack.a = pa;
						stack = stack.next;
					}

					yp = width;

					for (i = 1; i <= radius; i++) {
						yi = (yp + x) << 2;

						r_sum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i);
						g_sum += (stack.g = (pg = pixels[yi + 1])) * rbs;
						b_sum += (stack.b = (pb = pixels[yi + 2])) * rbs;
						a_sum += (stack.a = (pa = pixels[yi + 3])) * rbs;

						r_in_sum += pr;
						g_in_sum += pg;
						b_in_sum += pb;
						a_in_sum += pa;

						stack = stack.next;

						if (i < heightMinus1) {
							yp += width;
						}
					}

					yi = x;
					stackIn = stackStart;
					stackOut = stackEnd;
					for (y = 0; y < height; y++) {
						p = yi << 2;
						pixels[p + 3] = pa = (a_sum * mul_sum) >> shg_sum;
						if (pa > 0) {
							pa = 255 / pa;
							pixels[p] = ((r_sum * mul_sum) >> shg_sum) * pa;
							pixels[p + 1] = ((g_sum * mul_sum) >> shg_sum) * pa;
							pixels[p + 2] = ((b_sum * mul_sum) >> shg_sum) * pa;
						} else {
							pixels[p] = pixels[p + 1] = pixels[p + 2] = 0;
						}

						r_sum -= r_out_sum;
						g_sum -= g_out_sum;
						b_sum -= b_out_sum;
						a_sum -= a_out_sum;

						r_out_sum -= stackIn.r;
						g_out_sum -= stackIn.g;
						b_out_sum -= stackIn.b;
						a_out_sum -= stackIn.a;

						p = (x + (((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) * width)) << 2;

						r_sum += (r_in_sum += (stackIn.r = pixels[p]));
						g_sum += (g_in_sum += (stackIn.g = pixels[p + 1]));
						b_sum += (b_in_sum += (stackIn.b = pixels[p + 2]));
						a_sum += (a_in_sum += (stackIn.a = pixels[p + 3]));

						stackIn = stackIn.next;

						r_out_sum += (pr = stackOut.r);
						g_out_sum += (pg = stackOut.g);
						b_out_sum += (pb = stackOut.b);
						a_out_sum += (pa = stackOut.a);

						r_in_sum -= pr;
						g_in_sum -= pg;
						b_in_sum -= pb;
						a_in_sum -= pa;

						stackOut = stackOut.next;

						yi += width;
					}
				}
				return imageData;
			}

			function processCanvasRGB(canvas, top_x, top_y, width, height, radius) {
				if (isNaN(radius) || radius < 1) return;
				radius |= 0;

				var imageData = getImageDataFromCanvas(canvas, top_x, top_y, width, height);
				imageData = processImageDataRGB(imageData, top_x, top_y, width, height, radius);

				canvas.getContext('2d').putImageData(imageData, top_x, top_y);
			}

			function processImageDataRGB(imageData, top_x, top_y, width, height, radius) {
				var pixels = imageData.data;

				var x, y, i, p, yp, yi, yw, r_sum, g_sum, b_sum,
					r_out_sum, g_out_sum, b_out_sum,
					r_in_sum, g_in_sum, b_in_sum,
					pr, pg, pb, rbs;

				var div = radius + radius + 1;
				var w4 = width << 2;
				var widthMinus1 = width - 1;
				var heightMinus1 = height - 1;
				var radiusPlus1 = radius + 1;
				var sumFactor = radiusPlus1 * (radiusPlus1 + 1) / 2;

				var stackStart = new BlurStack();
				var stack = stackStart;
				for (i = 1; i < div; i++) {
					stack = stack.next = new BlurStack();
					if (i == radiusPlus1) var stackEnd = stack;
				}
				stack.next = stackStart;
				var stackIn = null;
				var stackOut = null;

				yw = yi = 0;

				var mul_sum = mul_table[radius];
				var shg_sum = shg_table[radius];

				for (y = 0; y < height; y++) {
					r_in_sum = g_in_sum = b_in_sum = r_sum = g_sum = b_sum = 0;

					r_out_sum = radiusPlus1 * (pr = pixels[yi]);
					g_out_sum = radiusPlus1 * (pg = pixels[yi + 1]);
					b_out_sum = radiusPlus1 * (pb = pixels[yi + 2]);

					r_sum += sumFactor * pr;
					g_sum += sumFactor * pg;
					b_sum += sumFactor * pb;

					stack = stackStart;

					for (i = 0; i < radiusPlus1; i++) {
						stack.r = pr;
						stack.g = pg;
						stack.b = pb;
						stack = stack.next;
					}

					for (i = 1; i < radiusPlus1; i++) {
						p = yi + ((widthMinus1 < i ? widthMinus1 : i) << 2);
						r_sum += (stack.r = (pr = pixels[p])) * (rbs = radiusPlus1 - i);
						g_sum += (stack.g = (pg = pixels[p + 1])) * rbs;
						b_sum += (stack.b = (pb = pixels[p + 2])) * rbs;

						r_in_sum += pr;
						g_in_sum += pg;
						b_in_sum += pb;

						stack = stack.next;
					}

					stackIn = stackStart;
					stackOut = stackEnd;
					for (x = 0; x < width; x++) {
						pixels[yi] = (r_sum * mul_sum) >> shg_sum;
						pixels[yi + 1] = (g_sum * mul_sum) >> shg_sum;
						pixels[yi + 2] = (b_sum * mul_sum) >> shg_sum;

						r_sum -= r_out_sum;
						g_sum -= g_out_sum;
						b_sum -= b_out_sum;

						r_out_sum -= stackIn.r;
						g_out_sum -= stackIn.g;
						b_out_sum -= stackIn.b;

						p = (yw + ((p = x + radius + 1) < widthMinus1 ? p : widthMinus1)) << 2;

						r_in_sum += (stackIn.r = pixels[p]);
						g_in_sum += (stackIn.g = pixels[p + 1]);
						b_in_sum += (stackIn.b = pixels[p + 2]);

						r_sum += r_in_sum;
						g_sum += g_in_sum;
						b_sum += b_in_sum;

						stackIn = stackIn.next;

						r_out_sum += (pr = stackOut.r);
						g_out_sum += (pg = stackOut.g);
						b_out_sum += (pb = stackOut.b);

						r_in_sum -= pr;
						g_in_sum -= pg;
						b_in_sum -= pb;

						stackOut = stackOut.next;

						yi += 4;
					}
					yw += width;
				}

				for (x = 0; x < width; x++) {
					g_in_sum = b_in_sum = r_in_sum = g_sum = b_sum = r_sum = 0;

					yi = x << 2;
					r_out_sum = radiusPlus1 * (pr = pixels[yi]);
					g_out_sum = radiusPlus1 * (pg = pixels[yi + 1]);
					b_out_sum = radiusPlus1 * (pb = pixels[yi + 2]);

					r_sum += sumFactor * pr;
					g_sum += sumFactor * pg;
					b_sum += sumFactor * pb;

					stack = stackStart;

					for (i = 0; i < radiusPlus1; i++) {
						stack.r = pr;
						stack.g = pg;
						stack.b = pb;
						stack = stack.next;
					}

					yp = width;

					for (i = 1; i <= radius; i++) {
						yi = (yp + x) << 2;

						r_sum += (stack.r = (pr = pixels[yi])) * (rbs = radiusPlus1 - i);
						g_sum += (stack.g = (pg = pixels[yi + 1])) * rbs;
						b_sum += (stack.b = (pb = pixels[yi + 2])) * rbs;

						r_in_sum += pr;
						g_in_sum += pg;
						b_in_sum += pb;

						stack = stack.next;

						if (i < heightMinus1) {
							yp += width;
						}
					}

					yi = x;
					stackIn = stackStart;
					stackOut = stackEnd;
					for (y = 0; y < height; y++) {
						p = yi << 2;
						pixels[p] = (r_sum * mul_sum) >> shg_sum;
						pixels[p + 1] = (g_sum * mul_sum) >> shg_sum;
						pixels[p + 2] = (b_sum * mul_sum) >> shg_sum;

						r_sum -= r_out_sum;
						g_sum -= g_out_sum;
						b_sum -= b_out_sum;

						r_out_sum -= stackIn.r;
						g_out_sum -= stackIn.g;
						b_out_sum -= stackIn.b;

						p = (x + (((p = y + radiusPlus1) < heightMinus1 ? p : heightMinus1) * width)) << 2;

						r_sum += (r_in_sum += (stackIn.r = pixels[p]));
						g_sum += (g_in_sum += (stackIn.g = pixels[p + 1]));
						b_sum += (b_in_sum += (stackIn.b = pixels[p + 2]));

						stackIn = stackIn.next;

						r_out_sum += (pr = stackOut.r);
						g_out_sum += (pg = stackOut.g);
						b_out_sum += (pb = stackOut.b);

						r_in_sum -= pr;
						g_in_sum -= pg;
						b_in_sum -= pb;

						stackOut = stackOut.next;

						yi += width;
					}
				}

				return imageData;
			}

			function BlurStack() {
				this.r = 0;
				this.g = 0;
				this.b = 0;
				this.a = 0;
				this.next = null;
			}

			module.exports = {
				image: processImage,
				canvasRGBA: processCanvasRGBA,
				canvasRGB: processCanvasRGB,
				imageDataRGBA: processImageDataRGBA,
				imageDataRGB: processImageDataRGB
			};

		}, {}]
	}, {}, [1])(1)
});
</script>
	</body>
</html>
